package cn.edu.hqu.cst.android.ls.datasaving;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.app.Activity;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;


public class MainActivity extends AppCompatActivity {
  SharedPreferences preferences;
  Button bn;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        preferences = getSharedPreferences(("count"), MODE_PRIVATE);
        //读取count数据
        int count = preferences.getInt("count",0);
        // 显示程序以前使用的次数
        Toast.makeText(this,"程序以前被使用了"+count+"次",Toast.LENGTH_LONG).show();
        SharedPreferences.Editor editor=preferences.edit();
        //存入数据
        editor.putInt("count",++count);
        //提交修改
        editor.apply();
        bn = findViewById(R.id.bn);
        bn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i = new Intent(MainActivity.this , Main2Activity.class);
                startActivity(i);
            }
        });
    }
}
